Frame Transmission System and Frame Transmission Apparatus

1. A frame transmission apparatus that collects a plurality of frames supplied via multiple cables forming a single logic path based on link aggregation setting and outputs the collected frames to a single output line, the apparatus comprising: a delay information storage unit which stores delay information indicating a transmission delay measured at a receiving side of each of the multiple cables; a reception timing correcting unit which corrects reception timings of the plurality of frames supplied via the multiple cables for the delay information corresponding to the multiple cables through which the plurality of frames have been supplied; and a data recovery unit which collects the plurality of frames supplied via the multiple cables in an order of the reception timings corrected by the reception timing correcting unit and outputs the collected frames to the output line.

2. A frame transmission system for transmitting data constituted of a plurality of frames transferred in a sequential manner, the system comprising: a sender-side transmission apparatus that distributes the plurality of frames supplied via an input line among multiple cables forming a single logic path based on link aggregation setting and outputs the plurality of frames to the multiple cables; and a receiver-side transmission apparatus that collects the plurality of frames supplied in a distributed manner among the multiple cables and outputs the collected frames to a single output line, wherein said sender-side transmission apparatus includes a maintenance frame output unit which inserts, into a maintenance frame for measuring a delay of each of the multiple cables, transmission timing information indicating a transmission timing of the maintenance frame and outputs the maintenance frame to each of the multiple cables, and wherein said receiver-side transmission apparatus includes a delay information storage unit which receives the maintenance frame supplied via each of the multiple cables and obtains delay information of each of the multiple cables on the basis of the transmission timing information inserted into the maintenance frame and a reception timing of the maintenance frame, a reception timing correcting unit which corrects reception timings of the plurality of frames supplied via the multiple cables for the delay information corresponding to the multiple cables through which the plurality of frames have been supplied, and a data recovery unit which collects the plurality of frames in an order of the reception timings corrected by the reception timing correcting unit and outputs the collected frames to the output line.

3. The frame transmission system according to claim 2 , wherein the maintenance frame output unit outputs, as the maintenance frame, an Ether OAM frame defined by ITU-T Y.1731.

4. The frame transmission system according to claim 2 , wherein the sender-side transmission apparatus includes a distribution unit which gives priority to, among the multiple cables, a cable with a smaller amount of transmission data and distributes a frame to the cable given priority.

5. A method of collecting a plurality of frames supplied via multiple cables forming a single logic path based on link aggregation setting and outputting the collected frames to a single output line, the method comprising: storing delay information indicating a transmission delay measured at a receiving side of each of the multiple cables; correcting reception timings of the plurality of frames supplied via the multiple cables for the delay information corresponding to the multiple cables through which the plurality of frames has been supplied; and collecting the plurality of frames supplied via the multiple cables in an order of the reception timings corrected by the reception timing correcting unit and outputs the collected frames to the output line.